#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2016-2017 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM.
#
#     OpenFOAM is free software: you can redistribute it and/or modify it
#     under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 3 of the License, or
#     (at your option) any later version.
#
#     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
#     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
#     for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     makeMesa
#
# Description
#     Build script for Mesa
#
# Note
#     Building with mesa-12.x.x fails to create an include/GL directory and
#     an "osmesa.h" file. Both make it fairly useless for off-screen VTK.
#
#     Building with mesa-11.x is fine and mesa-13.x also seems to be okay.
#
#------------------------------------------------------------------------------
# Special purpose script, no default version.
unset mesaPACKAGE

#------------------------------------------------------------------------------
# Run from third-party directory only
cd ${0%/*} || exit 1
wmakeCheckPwd "$WM_THIRD_PARTY_DIR" || {
    echo "Error: Current directory is not \$WM_THIRD_PARTY_DIR"
    echo "    The environment variables are inconsistent with the installation."
    echo "    Check the OpenFOAM entries in your dot-files and source them."
    exit 1
}
. etc/tools/ThirdPartyFunctions
#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

usage: ${0##*/} [OPTION] mesa-VERSION
options:
  -gcc              Force gcc/g++ instead of the values from \$WM_CC, \$WM_CXX
  -help

* build Mesa with
      ${mesaPACKAGE:-'unspecified MESA version'}

USAGE
    exit 1
}
#------------------------------------------------------------------------------
# Ensure configure gets the correct C/C++ compiler
[ -n "$WM_CC" ]  && export CC="$WM_CC"
[ -n "$WM_CXX" ] && export CXX="$WM_CXX"

# Non-standard location for clang?
unset thirdPartyClang
if [ "$WM_COMPILER_TYPE" = ThirdParty -a "$WM_COMPILER" = Clang ]
then
    thirdPartyClang=true
fi

# Parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage
        ;;
    -gcc)
        export CC=gcc    # use gcc/g++
        export CXX=g++
        unset thirdPartyClang
        ;;
    mesa-*)
        mesaPACKAGE="${1%%/}"
        ;;
    *)
        die "unknown option/argument: '$1'"
        ;;
    esac
    shift
done

[ -n "$mesaPACKAGE" ] || die "The mesa-VERSION was not specified"

# Nothing to build
if _foamIsNone "$mesaPACKAGE"
then
    echo "Using mesa-none (skip ThirdParty build of MESA)"
    exit 0
elif _foamIsSystem "$mesaPACKAGE"
then
    echo "Using mesa-system (skip ThirdParty build of MESA)"
    exit 0
fi

#------------------------------------------------------------------------------
# Locate third-party clang as required
if [ "$thirdPartyClang" = true ]
then
    thirdPartyClang=$(command -v clang) || {
        echo "Error: could not properly locate clang"
        exit 2
    }

    # root installation directory
    thirdPartyClang=${thirdPartyClang%/bin/clang}

    [ -d "$thirdPartyClang" ] || {
        echo "Error: could not properly locate clang"
        exit 2
    }
fi

#------------------------------------------------------------------------------
#
# Build MESA
# For 64-bit
# - MESA itself will normally build into 'lib64'.
#
#   MESA_SOURCE_DIR : location of the original sources
#   MESA_ARCH_DIR   : installation directory

MESA_SOURCE_DIR=$sourceBASE/$mesaPACKAGE
MESA_ARCH_PATH=$installBASE/$mesaPACKAGE

#
# Manual adjustments to mesa
# - avoid GLES (GLES1) since <GLES/gl.h> may mask the <GL/gl.h> header
adjustMESA()
{
    \rm -rf $MESA_ARCH_PATH/include/GLES $MESA_ARCH_PATH/include/GLES1
    echo "removed all gles1 includes"
}

(
    # configuration options:
    unset configOpt

    if [ -d "$thirdPartyClang" ]
    then
        configOpt="$configOpt --with-llvm-prefix=$thirdPartyClang"
    fi

    # end of configuration options
    # ----------------------------
    buildDIR=$buildBASE/$mesaPACKAGE

    cd $MESA_SOURCE_DIR || exit 1

    # remove any existing build
    rm -rf $MESA_ARCH_PATH
    rm -rf $buildDIR
    mkdir -p $buildDIR
    cd $buildDIR

    echo "----"
    echo "Building $mesaPACKAGE"
    echo "    Source         : $MESA_SOURCE_DIR"
    echo "    Target         : $MESA_ARCH_PATH"
    if [ -d "$thirdPartyClang" ]
    then
        echo "    Clang          : $thirdPartyClang"
    fi
    echo "----"

    # possibly for older mesa versions (see paraview wiki)
    # CXXFLAGS="-O2 -DDEFAULT_SOFTWARE_DEPTH_BITS=31" \
    # CFLAGS="-O2 -DDEFAULT_SOFTWARE_DEPTH_BITS=31" \

    ## autoreconf -fi
    set -x
    $MESA_SOURCE_DIR/configure \
        --prefix=$MESA_ARCH_PATH \
        --disable-xvmc \
        --disable-glx \
        --disable-dri \
        --disable-egl \
        --disable-gles1 \
        --enable-texture-float \
        --enable-gallium-osmesa --with-gallium-drivers=swrast \
        $configOpt \
        && make -j $WM_NCOMPPROCS \
        && make install \
        && adjustMESA \
        && echo "Built $mesaPACKAGE"
) || {
    echo "Error building: MESA"
    exit 1
}

# ----------------------------------------------------------------- end-of-file